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| Home / Outboard Engines / Mercury Engines / Mercury 10 Sea Pro |
Mercury Sea Pro 10 Troubleshooting
| Engine starts hard or won't start |
Empty gas tank - Add gasoline.
Wrong grade of gasoline - Change gasoline.
Clogged fuel system - Remove clogging.
Damaged spark plug wiring connection - Check spark plug wiring connection, repair or change.
Faulty spark plug - Install new spark plug.
Plugged fuel filter - Fuel filter needs changing.
Carburetor is clogged - Clean the carburetor.
Fuel lines clogging - Fuel lines need to be cleaned.
Closed or restricted fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Lack of fuel pump pressure - Repair or change fuel pump.
| Engine starts and stops immediately |
Spark plug is damaged - Change spark plug.
Faulty or dirty carburetor - Clean or replace carburetor.
Damaged ignition coil - Install a new ignition coil.
Closed or restricted fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Low fuel pump pressure - Repair or change fuel pump.
Faulty thermal relief valve - Install new relief valve.
| Engine runs unevenly |
Ignition system malfunction - Check ignition and replace faulty components.
Clogged or damaged fuel pump - Clean or install new fuel pump.
Incorrect carburetor adjustment - Adjust carburetor idle mixture screw.
Restricted fuel lines - Clean fuel lines.
Closed or restricted fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Fuel filter is clogged - Fuel filter needs changing.
Gaskets are worn - Change gaskets.
| Engine overheating |
Engine is running overloaded - Reduce load.
Too lean carburetor mixture - Set the carburetor properly.
Ignition timing is incorrect - Ignition timing needs to be adjusted correctly.
Thermostat failure - Install new thermostat.
Water pump malfunction - Change water pump.
| Engine noise or knocking |
Low octane fuel - Change gasoline.
Engine overload - Reduce engine load.
Low idle speed set incorrectly - Adjust idle speed.
Dirty or damaged fuel pump - Test fuel pump and replace if necessary.
Crankshaft or main bearings are worn out - Worn parts replacement required.
Cylinder bore or piston rings are worn - Replace faulty components.
| Engine loses power |
Improperly or clogged carburetor - Adjust the carburetor properly or clean it.
Clogged or defective fuel pump - Test fuel pump and replace if necessary.
Ignition failure - Check ignition and replace faulty components.
Gaskets are worn - Replace gaskets.
Worn powerhead components - Defective parts need to be replaced.
| Excessive fuel consumption |
Improper adjustment of carburetor main jet - Adjust the carburetor main jet correctly.
Faulty or loose spark plug - Replace or tighten spark plug.
Rings, sleeve, or piston are damaged - Replace defective parts as required.
| Trim motor is running but system can't move |
Low oil level - Need to add the oil.
Pump assembly is faulty - Test pump and replace if necessary.
Leakage of manual release valve - Close the valve or change it.
Pump driveshaft or motor damaged - Replace worn component.
| Trim does not fully up or down |
Pump assembly faulty - Change pump.
Tilt ram piston ball is in wrong position - Service or repair.
Tilt ram piston O-ring is worn - Replace O-ring.
Oil level is insufficient - Need to add the oil.
Lower check valve not seating in port side trim ram - Install valve correctly.
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| Engines Technical Specifications |